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From: Christoph Lameter <>
To: Nick Piggin <>
Cc: Linux Kernel Mailing List <>,
	Linux Memory Management List <>
Subject: Re: [patch] mm: NUMA replicated pagecache
Date: Wed, 14 Feb 2007 10:57:00 -0800 (PST)	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, 13 Feb 2007, Nick Piggin wrote:

> Just tinkering around with this and got something working, so I'll see
> if anyone else wants to try it.
> Not proposing for inclusion, but I'd be interested in comments or results.

We would be very interested in such a feature. We have another hack that 
shows up to 40% performance improvements.

> At the moment the code is a bit ugly, but it won't take much to make it a
> completely standalone ~400 line module with just a handful of hooks into
> the core mm. So if anyone really wants it, it could be quite realistic to
> get into an includable form.

Would be great but I am a bit skeptical regarding the locking and the 
additonal overhead moving back and forth between replications and non 
replicated page state.

> At some point I did take a look at Dave Hansen's page replication patch for
> ideas, but didn't get far because he was doing a per-inode scheme and I was
> doing per-page. No judgments on which approach is better, but I feel this
> per-page patch is quite neat.

Definitely looks better.

> - Would be nice to transfer master on reclaim. This should be quite easy,
>   must transfer relevant flags, and only if !PagePrivate (which reclaim
>   takes care of).

Transfer master? Meaning you need to remove the replicated pages? Removing 
of replicated pages should transfer reference bit?

> - Should go nicely with lockless pagecache, but haven't merged them yet.

When is that going to happen? Soon I hope?

  parent reply	other threads:[~2007-02-14 18:57 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-02-13  6:09 Nick Piggin
2007-02-13  6:09 ` Nick Piggin
2007-02-14  4:28 ` Nick Piggin
2007-02-14 18:57 ` Christoph Lameter [this message]
2007-02-15  0:07   ` Nick Piggin
2007-02-14 19:00 ` Christoph Lameter
2007-02-15  0:10   ` Nick Piggin
2007-02-15  0:13     ` Christoph Lameter
2007-02-14 20:32 ` Lee Schermerhorn
2007-02-15  0:38   ` Nick Piggin
2007-02-15 23:29     ` Lee Schermerhorn
2007-02-16 13:35       ` Nick Piggin

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